Wire cloth tightener



May 7, 1935 L.. G. sYMvoNsv Y2,000,426

WIRE CLOTH TIGHTENER Filed June-11, 1951 2 sheets-shea 1 'n lq\\ @Mq (lh.

May 7, 1935iv l.. G. sYMoNs 2,000,426

WIRE CLOTH TIGHTENER Filed June 1l, 1931 2 Sheets-Sheet 2 jaren Sy/Www Patented May 7, 1935 UNITED STATE-s PATENT v OFFICE Symons Brothers Development Company,

Hollywood, Calif., a corporation of Delaware Application June 11, 1931, Serial No. 543,572

'3 Claims. (Cl. 209-403) My` invention relates to an improvement in screens and has for one lpurpose the provision of an improved scr-een deck. One particular pur- .pose is the provision of improved tightening o means for tightening or taking up the slack in a wire cloth screen deck. Another Objectis the provision of a readily removable wire -cloth member from a screening'deck'orframe. Another object is the provision of meansfor main- 110 taining a. screen deck under tension. Other objects will appear from time to time in the course of the specication and claims.

Iillustrate my invention more or less diagramlmati'cally in the accompanying drawings, where- Figure 1 is a plan view;

Figure 2 is a side elevation partly in section;

Figure. 3-is a' detail;

Figure 4 is a partial end elevation partly in section;

Figure 5 is a section on the line 5-'5 of Figure 4; and

Figure 6 is a detail.

Like parts are indicated .by like symbols throughout the specication and drawings.

Since my invention relates to a screen deck which may be mounted in a Variety of manners I have not illustrated the details of any particular screen mounting or support. I therefore illustrate only the deck proper which may include for example the side frame members A, A1, which may be of angle iron, channel iron or the like but are here shown as formed of a Web A2 with flanges A3 A1 extending in opposite directions from the opposite edges thereof. The members A, A1 may be connected by any suitable cross members. I illustrate for example the angles A5 A6 adjacent the center of the screen and the pipes or cylindrical members AFl A8, arranged in groups, the members A7 being positioned between the angle A5 and one end of the screen and the members A2 being positioned between the angle A6 and the opposite end of the screen.

Secured to each of the members A5 A are Lv5 screen cloths B B1 respectively. Their inner edges may be secured to the angles as by the clamping strips B2, the bolts B3 and the nuts B4. It will be understood that this is illustrated merely as an example of attaching means whereby the inner edge of the members B or B1 may be readily and removably secured to the angles A5 or A6- The opposite end of each of the members B or B1 extends about a reel or pipe or cylinder B5 at the end of the screen. The members B5 t into notches B5 in the screen ends and the Cin 4vends of the mesh sections B or B1 pass thereabout as at B7, being secured for example by bolts B8, nuts B9 and washer B10.

Secured to the side screen framemembers A2 fadjacenttheir ends and also formed or notched for the penetration of the rolls B5 are thexed plates C which may for example be welded to the web A2 ofthe side frame members A or A1. Rotatable in relation to each end of eachroll B5 is a disc C1. roll B5, upon which it is threaded, but may be held against rotation in'relation to the plate C 'for example by a bolt C2 which passes through Aany one 'of the apertures C3 about the periphery of the Vplate' C1. v Some of the aperturesCKcom'- municate by notches C1 with the periphery `of the disc C1. In tightening-up the device the 'operator may employ the tool generally indicated las Ein Figure 6 'which includes a handle portion E1, an eye E2 adapted to surround the plate C1 and an abutment E3 adapted to penetrate the notches C4. The operator may thereby rotate the plate C1 to draw out upon the screen member B or B1 until the desired tension is obtained. rI'he bolt C2 is then inserted through the side frame web A2, the plate C and the disc C1.

If desired yielding means may be employed to maintain the roller B5 positioned to wind in on the screen cloth. I may employ for example the coil spring D one end of which is secured to a pin or abutment or bolt D1 on the member B5, the other engaging an abutment D2 on the disc C1. on the roller B5 and thus to maintain the screening member B or B1 under constant tension. The tool E may be employed to rotate the disc C1 to relieve the tension on the spring, in order to permit release of the screen from the roll Bfi and removal of the screen B or B1 from the deck.

It will be realized that whereas I have described and shown a practical and operative device, nevertheless many changes might be made in size, shape, number and disposition oi parts without departing from the spirit of my invention. I therefore wish my description and drawings to be taken as in a broad sense illustrative and diagrammatic rather than as limiting me to my specific showing. l

The use and operation of my invention are as follows:

I iind it desirable to maintain a screen deck of wire mesh or the like under constant tension. My roller B5 with the spring D is an eiiicient means of obtaining this result. The springD This disc C1 is centered by the The spring D tends at all times to reel in i tends at all times to roll the roller in and to put tension on the cloth section B or B1. I nd it desirable but not necessary to divide the screen surface into a plurality of units. A convenient arrangement is to employ two units, secured to the screen deck at the middle of the deck, and each secured to a separate spring actuated roller B5 at the end of the deck. In case there is unevenness at different parts of the screen, this arrangement enables one section to be removed at a time without disturbing the remaining section.

It will be observed that the supports A7 and A8 are so arranged as to more or less arch the screen and give it transverse support throughout the screen deck. The screen is also held down against the members A7 A8, adding to the rigidity of the screen and limiting its flexure during use. Thus substantially the sole vibration imparted to the screen cloth is the Vibration actually imparted to the deck or frame itself, and secondary vibration of the screen cloth is prevented.

I claim:

1. In a screen, a screen frame, longitudinal members therefor, transverse members connecting the longitudinal members intermediate their ends, a plurality of screen members, each removably secured to a transverse member intermediate the ends of the frame, a rotary member mounted upon each end of the screen framato which one of said screen members is secured, and means for rotating said rotary member and for thereby maintaining said screen member under tension, said means including helical springs generally concentric with the axis of rotation of said rotary member, one end of each such spring being secured in relation to the screen frame, the other being secured in relation to the rotarymember.

2. In a screen, a screen frame, longitudinal members therefor, transverse members connecting the longitudinal members intermediate their ends, a plurality of screen members, each removably secured to a transverse member intermediate the ends of the frame, a rotary member mounted upon each end. of the screen frame, to which one of said screen members is secured, and means for rotating said rotary member and for thereby maintaining said screen member under tension, said means including helical springs generally concentric With the axis of rotation of said rotary member, one end of each such spring being secured in relation to the screen frame, the other being secured in relation to the rotary member, and means for adjusting tension upon said screen members.

3. In a screen, a screen frame, longitudinal members therefor, transverse members connecting the longitudinal members intermediate their ends, a plurality of screen members, each removably secured to a transverse member intermediate the ends of the frame, a rotary member mounted upon each end of the screen frame, to which one of said screen members is secured, and means for rotating said rotary member and for thereby maintaining said screen member under tension, said means including helical springs generally concentric with the axis of rotation of said rotary member, one end-of each such spring being .secured in relation to the screen frame, the other being secured in relation to the rotary member, and means for adjusting tension upon said, screen members, including a rotatably adjustable abutment for each such spring, said abutment being normally xed in relation to the screen frame during use of the screen, and means for positioning it in relation to the screen frame at a plurality of adjustments.

LOREN G. SYMONS. 

